"As some have said, I would attempt to meet the person who wrote the letter. Invite them over for tea."
Yeah, but what would you slip into that person's teacup? I'm inclined to something simple and earthy, like bisacodyl, cascara, or senna.
Think of it as giving that individual something other than a neighbor's business to occupy idle time and energy.
"In this world of sin and sorrow there is always something to be thankful for. As for me, I rejoice that I am not a Republican." [H.L. Mencken]